If you're playing weekend pickup games most places don't usually care unless it's a special event or the organizer wants to setup the game/experience for a certain kind of player.
If you're going for a milsim it's usually a no go, daysims or shorter half day scenarios it might have special rules (eg. must take out mag before winding the hicap then reload or something).
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE